Guard for punch presses



Apri? i3 1%26.

W. A. WIESMAN GUARD FOR PUNCH PRESSES Filed July 16. 1924 Patented Apr.13, 1926."

WILLIAM A. WIESMAN, 0F DAYTON, OHIO.

', GUARDIFOB P NCH PBESSES. I

Application filed July 16,

To all whom it may concern:

Be it known that I, WILLIAM A. VVIESMAN, a citizen of the United States,residing at Dayton, in the county of Montgomery and State of Ohio, anduseful Improvements in Guards for Punch Presses, of which the followingis a specification, referen'cebeing had therein to the accompanyingdrawing.

This invention relates to guards for punch presses and similar machinesand more par ticularly' to that type of guard in which an oscillatingarm is moved across the ma chine in front of the punch and die duringthe downward movement of the punch and is restored to its initialposition during the upward One object of the invention is to providemovement of the punch.

a guard of this kind which, will'operate smoothly and uniformly. q r I Afurther object of the invention is to provided such a guard with meansfor absorbing the shock which is due to the stopping and reversing ofthe direction of movement of the guard. Q

Other objects of the invention will appear as the device is described indetail.

In the accompanying drawings Fig. 1" is a front elevation showing myinvention applied to a punch press; Fig. 2 is a section taken on theline 2-2 of Fig. 1;'and Fig. 3 is a seoti n taken on the line 33 .ofFig. 1. i y In these drawings I have'illustrated my invention 'inconnection with, an oscillating guard of a well known construction andhave shown the same as applied to an ordinary punch press. It willbeapparent, however, that the invention maybe utilized in connectionwith guardsof various kinds,

which'may be applied to machines of different kinds.

T'he punch press, as here showmcomprises a main frame 1 having a dieblock 2near the lower end thereof. Slidably mounted in the'frame is aplunger 3 which carries the punch its upper endwith a bearing 5 whichengages the offset portion of the crank shaft 6 which is journaled inbearings 7 at the upper end of the frame, whereby the rota.- tion of thecrank shaft will im art vertical reciprocatory movement to t e plunger,

The guard maybe mounted on the machine in Y any sultabie manner acrossbar 8 is mounted in brackets 9 which have. invented certain newvertical slot 11.

clampingv member 13 and has jing member 15. This head has end atransverse bar project beyond the respective sides of the ends'of saidparts 4. This plunger is connected at ahead. The oscillating structure,

but, as here; shown, the guard-arm forms-a part, may be rocked 1924.Serial 110,726,331,

are rigidly secured to the main frame on the respective sides of theplunger. This cross bar is provided with an upwardly ertending portionor standard 10 having Mounted on the standard is a suitablesupportingstructure adapted to carry the movable guard member and, inthe presentform of the device, this supporting structure comprisesclamping members or washers 12 and 13 engaging, respectively, the rearand front faces of the standardlO and clamped against the same by meansof a bolt 14 which extends through the clamping members and through theslot in the standard The faces of the standard and of the clampingmembers are preferably serrated toholdthe supporting structurepositively against movement on the standard. The bolt 14 extendsbeyondthe front mounted thereon a bushing15 which is provided with acircumferential flange 16 so arranged as to form between the same andthe clamping member 13, a groove or hearing. bolt is tightened down onthe nut 14 the bushing and the two clamping members are rigidly securedto the standardlO and constitute a rigid supporting structure. Mountedon this supporting structure an oscillating structure which, as hereshown, comprises'a head 17 confined in the groove between the fir nge.16 and the clamp- 13 and journaled on the bushing 7 a downwardlyextending integral Farm 18 which carries at its lower 19, the ends ofwhich arm 18 and are provided with ape-rtured end portions, 20, toreceive the two parts, 21 and'22, of a guard arm 23, the upper above thetransverse bar 19. ,Rigidly secured to the head 17 is a rod or arm 24,arranged substantially parallel with the transverse bar 19 and providedat its ends with a clamping device 25 to receive the upper endof thepart 21 of the guard arm and rigidly connect I the same to the rod v24.A second clamping member 26 is socured to the head 17 on that sidethereof opposite the rod 24 and is adapted to receive the upper endportion of the part 22 of the guard arm and secure the same to the ofwhich about its axis in any suitable manner which extending somedistance will cause the lower end portion of the guard arm to sweepacross the machine in timed relation to the movements of the plunger. 1nthe present device abearing block 27 is slidably and rotatably mountedon the rod 2-1 and has in its upper portion, a transverse bearing toreceive a rod 28 which is connected with the bearing 5 ot the plunger soas to move therewith and thus impart n'iovement to the oscillatingstructure.

Associated with the oscillating structure are yieldable devices soarranged that they will serve to cushion the movements of theoscillatingstructure as the guard arm approaches one end or the other ofits movement, thus absorbing the shock due to the sudden 'S'L'OPPIDP;and reversmg ot the direetion of movement of the guard arm.

These yieldable devices may take various forms and may be mounted invarious ways but in "that form of the device here shown Ihave providedthe forward clamping member or washer-14 with downwardly diverging arms"29, which are here shown as formed integral therewith. Each of thesearms is provided at its lower end with a tubular member 30 whichconstitutes a soclc et adapted to IGCGIVG. a coiled spring 31.

The oscillating structure is provided with a part forming a stop whichis adapted to engage the springs in said sockets and com press the sameas the guard arm approaches the limit 01" its movement in one directionor the other. In the present. construction, tubular members 30 areprovided in their front Walls with slots 32 which form guideways for thestop which is shown in the form of a pin 33 mounted in the arm 18 of theoscillating structure. Preferably the two tubular members 30 are formedin a single casting and the intermediate portion of said casting isslotted, as shown at 3 k, to form a continuation of the guides 32 in thesockets. Consequentlythe pin is guided in the slot during all partsot-its movement and, further, by connecting the two tubular members oneto the other the two structure; "ets 30 are open at their outer ends toperarms 29 are braced one against the other and greater strength 1simparted to the The tubular members or sockmit the springs tobe'inserted in and removed from the same and pins 35 extend through theends of the tubular members to retain the springs therein. If desired,

the stop or pin 33 may be slidably mounted on the oscillating structureto permit the same to be withdrawn from the slot or 'gu1dev.'ay torelease the oscillating structure from the tension of the spring andfacilitate its removal from, or mounting on, the supporting.strueture'As here shown, the arm 18 is provided with a hollow boss 36 forming-asocket in which the pin 33 is ing structure,

modifications may appear to a person skilled in the art.

Having now fully described my invention, what I claim as new and desireto secure by Letters Patent, is:

1. The combination with a machine comprising a frame and a plungermounted on said frame, of a guard arm movably mounted on said frame,means torimparting oscillatory. movement to said guard arm in accordancewith the "movements of said plunger, a part connected with said guardarm and forming a stop, and yieldable devices arranged on the oppositesides of said step and in the path thereof.

The combination with a machine com prising a frame and a plunger mountedon said frame, of a guard arm movably mount ed on said frame, means "forimparting oscillatory movement to said guard arm in accordance withthemovements of said plunger, a part connected with said guard arm andforming a stop, hollow supporting members rigidly mounted on therespective sides of said stop andhaving slots to receive said step, andsprings mounted in said supporting members in the path of said stop.

3. In a device of the character described, a supporting structure,anoscillating structure pivotally mounted on said supporting structureand comprising aguard arm, means for actuating said oscillatingstructure, a stop carried by said oscillating struc ture, diverging armscarried by .saidsupportand yieldable devices carried by the respectivearms and arranged on opposite sides of and in the path of saidstop.

L. In a device of the character described, a supporting structure, anoscillating structure pivotally. mounted on said supporting structureand comprising a guard arm, means for actuating said oscillatingstructure, a stop carried by said oscillating structure, diverging armscarried by said supporting structure, sockets carried by said arms, andsprings mounted in the respective sockets and arrangedcn opposite sidesof and in the-path of said stop.

5. In a device of the characterdescribed, a supporting structure, anoscillating structure pivotally mounted onsaid supporting structure andcomprising a guard arm, means for actuating said oscillating struclit)ture, a stop carried by said oscillating structure, diverging armscarried by said supporting structure, tubular members carried by theends of the respective arms and adapted to receive said stop,springsmounted in the respective tubular members, said tubular members havingtheir outer ends open to permit said springs to be inserted in andremoved from the same, and removable means to retain said springs insaid tubular members. I

6. In a device a supporting structure, ture pivotally mounted on saidstructure and comprising a guard arm, means for actuating saidoscillating structure, a stop carried by said oscillating structure,diverging arms carried'by said sup porting structure, tubular memberscarried by the ends of the respective arms and adapted to receive of thecharacter described,

an oscillating strucother, and springs mounted in the respec tivetubular members and arranged to be engaged by said stop.

7. In a device of the character described, a supporting structure, anoscillating structure pivotally mounted on said supporting structure andmeans for actuating said oscillating structure, a stop carried by saidoscillating structure, diverging arms carried by said supportingstructure, said arms having at their lower ends part forming sockets andhaving longitudinal slots toreceive said stop, and springs mounted insaid sockets in the path of said stop.

8. In a device of the character described, a supporting structure, anoscillating structure pivotally mounted on said supporting supportingspaced one from the other,

said stop, said tubular members being rigidly connected one to thecomprising a guard arm,

structure and comprising a guard arm, means r'oractuating saidoscillating structure, a stop carried by said oscillating structure,diverging arms carried by said supporting structure, said arms having attheir lower ends parts forming sockets and having longitudinal slots toreceive saidstop, and springs mounted in said sockets in the path ofsaid stop, said sockets being 0on nected one to the other by anintermediate portion having a slot forming a continuation of the slotsformed in said sockets. Y

9. In a device of the character described, a supporting structure, anoscillating structure pivotally mounted on said supporting structure andcomprising a guard arm, means for actuating said oscillating structure,sockets mounted in fixed positions and springs mounted in said sockets,and'a stop carried by said oscillating structure and arranged to enterthe space between said sockets and to engage said springs.

10. In a device of the character described, a supporting structure, anoscillating structure pivotally mounted on said supporting structure andcomprising a guard arm, means for actuating said oscillating structure,sockets mounted in fixed positions and spaced one from the other,springs mounted in said sockets, a stop movably mounted on saidoscillating structure for movement into and out of the space betweensaid sockets, and a spring acting on said stop to hold the same normallyin the space between said sockets.

Intestimony Where hereto. 1

. WILLIAM A. VVIE SMAN.

f, I afiix my signature

